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Orsini, F.

Paper Title Page
TUPC024 Video Profile Monitors Development for the CTF3 Probe Beam Linac 1101
 
  • W. Farabolini, G. Adroit, P. Girardot, R. Granelli, F. Harrault, C. L.H. Lahonde-Hamdoun, T. Lerch, F. Orsini
    CEA, Gif-sur-Yvette
 
  The innovative CLIC concept is currently under study in the CLIC Test Facility (CTF3) at CERN where the acceleration of a probe beam will be demonstrated. This probe beam, delivered by a linac called CALIFES, is composed of short bunches (0.75 ps, 0.6 nC) at 170 MeV with normalized emittance lower than 20 mm.mrad. Measurements of longitudinal charges distribution, transverse emittance and energy spectrum rely on Video Profile Monitors (VPM) after appropriate manipulations of the beam (deflecting cavity, quad scan and analysis dipole). We report the design, development and tests of these new VPMs based on selectable YAG/OTR screens, optical line and CCD camera. Two selectable magnifications (1.75 and 0.33) are available via motorized lens mounts to comply both with resolution (20 μm) and field of view (10x10mm2). Study of optical line characteristics have been realised with Apilux software and Modulation Transfer Function (MTF) were measured. A grid pattern can be inserted at the screens position to check optical characteristics during operations. Tilt of the CCD plan in order to compensate the screen tilt of 15° has not proven to improve the depth of field and was not implemented.